[dev] Opera Browser

[steve]

I am using the last version of Opera 7.11, and it seems that Iframes is 
working on it. So I proposed to change:
lib/Browser.php

It seems that it was buggy on 6.0 and solved in 7.X (see 
http://www.xs4all.nl/~ppk/js/iframe.html)

Here is a patch:

Maybe we should also add a support for utf8?
222a223
 >                     $this->setFeature('iframes');